775220736 has 80 divisors (see below), whose sum is σ = 2071795968. Its totient is φ = 257587200.

The previous prime is 775220713. The next prime is 775220737. The reversal of 775220736 is 637022577.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 775220694 and 775220703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775220737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661431 + ... + 662601.

Almost surely, 2^775220736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775220736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035897984).

775220736 is an abundant number, since it is smaller than the sum of its proper divisors (1296575232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775220736 is a wasteful number, since it uses less digits than its factorization.

775220736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 39.

The square root of 775220736 is about 27842.7860674897. The cubic root of 775220736 is about 918.6324736149.

The spelling of 775220736 in words is "seven hundred seventy-five million, two hundred twenty thousand, seven hundred thirty-six".